Beamforming Channel Reporting Bitmap Overhead Reduction
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Solution Overview
Problem
In wireless communication systems employing beamforming, the overhead from reporting channel information degrades the performance due to the large amount of data that needs to be transmitted by user equipment (UE) to the evolved Node-B (eNB), which affects scheduling and efficiency.
Innovation Solution
A communication device receives beamformed reference signals from multiple beams, calculates channel quality indicators (CQIs), and transmits a bitmap or beam index indicating which CQIs are greater than a threshold, reducing the need to transmit all channel information and improving scheduling performance by providing essential feedback to the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports all channel information to the eNB using beamforming reference signals, then the network can make accurate scheduling decisions, but the overhead increases significantly degrading system performance
Solution Approach 1:
The patent extracts only the essential channel information (CQI values for beams exceeding threshold) from the complete channel state, transmitting only this critical subset to the eNB. This selective extraction maintains scheduling accuracy while dramatically reducing the volume of reported data, directly resolving the contradiction between measurement precision and quantity of reported information.
Solution Approach 2:
The patent changes the parameter representation by introducing a threshold-based filtering mechanism. Instead of reporting all CQI values, only beams with CQI exceeding a predefined threshold are reported, transforming the complete channel information set into a filtered subset. This parameter change reduces reporting overhead while preserving the most significant channel characteristics needed for scheduling decisions.
2Productivity
If the UE transmits detailed channel information for all beams, then the eNB can optimize resource allocation, but the scheduling efficiency decreases due to processing large amounts of feedback data
Solution Approach 1:
The patent extracts only the relevant beam information (those with CQI above threshold) for eNB processing. By removing unnecessary beam data from the feedback, the eNB receives a condensed set of information that maintains resource allocation optimization capability while significantly reducing the time required to process the feedback and make scheduling decisions.
3Adaptability or versatility
If the UE reports channel information for multiple beams, then the network can select the best beam for communication, but the complexity of the reporting mechanism increases
Solution Approach 1:
The patent changes the reporting mechanism by introducing a threshold parameter that automatically filters which beams are reported. This parameter-based filtering simplifies the reporting structure compared to reporting all beams, while still maintaining the ability to identify and report the best beams for communication, thus preserving adaptability without increasing complexity.
Data Source
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AI summary
A communication device of reporting channel information comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprise receiving a plurality of beamformed reference signals transmitted by a network via a plurality of beams, respectively; obtaining a plurality of channel quality indicators (CQIs) of the plurality of beams according to the plurality of beamformed reference signals; and transmitting a bitmap indicating whether the plurality of CQIs are greater than a threshold to the network.